ArcSecondsPerPixelCalculator

ArcSecondsPerPixelCalculator calculator can be used to calculate the arc seconds per pixel (ASP) for a given telescope, focal length, and image scale.

Input Parameters

Calculation Results

Calculation Formula

ASP = (206265 * Pixel Size) / Focal Length

Where:
ASP = Arc Seconds Per Pixel
Pixel Size = Pixel size in micrometers (µm)
Focal Length = Focal length in millimeters (mm)

ArcSecondsPerPixelCalculator Calculator Usage Guide

Learn how to use the ArcSecondsPerPixelCalculator calculator and its working principles

How to Use the Calculator

  1. Enter the focal length of your telescope in millimeters (mm). This is the distance from the lens or mirror to the focal plane.
  2. Enter the pixel size of your camera sensor in micrometers (µm). This can usually be found in the camera's specifications.
  3. Click the "Calculate" button to compute the arc seconds per pixel (ASP).
  4. The result will be displayed in the ASP field.

Understanding the Formula

The calculator uses the following formula to calculate the arc seconds per pixel:

ASP = (206265 * Pixel Size) / Focal Length

This formula converts the physical pixel size and focal length into the angular resolution of the image, measured in arc seconds per pixel. The constant 206265 is used to convert radians to arc seconds (1 radian = 206265 arc seconds).

Example

If you have a telescope with a focal length of 2000 mm and a camera sensor with a pixel size of 5 µm, the calculation would be:

ASP = (206265 * 5) / 2000 = 515.625 arc seconds per pixel

This means that each pixel in your image corresponds to an angular size of approximately 515.625 arc seconds.